Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
pose approximation » one approximation, _ approximation, rough approximations
time approximation » one approximation, _ approximation
qoe estimation » pose estimation, _ estimation, cover estimations

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( qoe estimation algorithms ) or ( ((pose approximation) OR (time approximation)) algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( qoe estimation algorithms ) OR ( ((pose approximation) OR (time approximation)) algorithms ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( qoe estimation algorithms ) or ( ((pose approximation) OR (time approximation)) algorithms ))*".